ABSTRACT

Tungsten has unique physical and chemical properties that make it ideal for high-temperature applications. At room temperature, it is being considered for medical applications due to its protection by an oxide/hydroxide film. However, breakdown of the oxide film and tungsten dissolution can have adverse effects on human health. This study investigates the corrosion of tungsten with and without dispersed oxides of rare-earth elements (ThO₂, CeO₂, and La₂O₃) in a 3 wt-% NaCl solution using electrochemical techniques. The results suggest that tungsten dissolution occurs after the formation of an oxide film, likely WO₃, on the surface of tungsten and dispersed oxide tungsten. La₂O₃ and CeO₂ may decrease the corrosion rate of tungsten, while WThO₂/tungsten has similar corrosion rates to tungsten. The study concludes that CeO₂ or La₂O₃ could replace ThO₂ in tungsten due to the radioactive nature of Th.

摘要

钨具有独特的物理和化学特性，使其成为高温应用的理想选择。在室温下，由于其受到氧化物/氢氧化物膜的保护，它被考虑用于医疗应用。然而，氧化膜的破裂和钨的溶解会对人体健康产生不利影响。本研究使用电化学技术研究了在 3 wt-% NaCl 溶液中有和没有稀土元素（ThO ₂、CeO ₂和 La ₂ O _{3 ）分散氧化物的钨的腐蚀。}结果表明，钨溶解发生在钨和分散的氧化钨表面形成氧化膜（可能是 WO _{3 ）之后。}拉₂欧₃和CeO ₂可以降低钨的腐蚀速率，而WThO ₂ /tungsten 具有与钨相似的腐蚀速率。该研究得出结论，由于 Th 的放射性，CeO ₂或 La ₂ O ₃可以替代钨中的 ThO _{2 。}